Title :
Ni0.5Zn0.5Fe2O4/ bamboo charcoal/titania LDPE composites as viable microwave absorbing materials
Author :
Gogoi, J.P. ; Sarmah, S. ; Sarmah, D. ; Bhattacharyya, N.S.
Author_Institution :
Dept. of Phys., Tezpur Univ., Napaam, India
Abstract :
A combination of bamboo charcoal (BC), titania (TiO2) and Ni0.5Zn0.5Fe2O4 spinel ferrites particles were synthesized by hydrothermal method and introduced into Low Density Polyethylene (LDPE) to be a Microwave Absorber. The structural characterizations and surface morphology of Ni0.5Zn0.5Fe2O4/BC/Ti composites were investigated by X-ray diffraction (XRD) and scanning electron microscopy respectively. The complex permittivity of composites with polymer to fillers weight ratios (5:1 & 5:2) was measured in 8-12 GHz microwave frequency range using waveguide technique and the corresponding dielectric loss in the same frequency range. The experimental results reveal a loss tangent variation from 0.25 to 0.30 over X band for 5:2 w/w ratios and almost 0.11 for 5:1 w/w ratios. Therefore, Ni0.5Zn0.5Fe2O4/BC/Ti composites will be a suitable microwave absorptive material for X band frequency range.
Keywords :
X-ray diffraction; dielectric losses; electromagnetic wave absorption; ferrites; microwave materials; nickel compounds; permittivity; scanning electron microscopy; titanium compounds; zinc compounds; LDPE composites; Ni0.5Zn0.5Fe2O4; TiO2; X-ray diffraction; bamboo charcoal; complex permittivity; dielectric loss; frequency 8 GHz to 12 GHz; hydrothermal method; loss tangent variation; low density polyethylene; microwave absorbers; microwave absorbing materials; scanning electron microscopy; spinel ferrites particles; structural characterizations; surface morphology; titania; waveguide technique; Polymer composite; complex permittivity; dielectric loss; microwave absorbers;
Conference_Titel :
Applied Electromagnetics Conference (AEMC), 2009
Conference_Location :
Kolkata
Print_ISBN :
978-1-4244-4818-0
Electronic_ISBN :
978-1-4244-4819-7
DOI :
10.1109/AEMC.2009.5430638
